A robust and versatile date calculator script that provides precise calculations of time intervals between dates. This tool is part of the comprehensive shell_utils framework, one of the largest collections of scripts and utilities designed to enhance user experience in shell environments.

• Multilingual Support: Comprehensive internationalization with support for multiple languages:

  • English, Portuguese, French, Spanish, German
  • Hebrew, Arabic, Russian, Romanian
  • Chinese, Korean Each language includes complete error messages and user prompts.

• Precise Calculations:

  • Accurate computation of differences in years, months, and days
  • Proper handling of edge cases around month endings and year transitions
  • Intelligent management of varying month lengths
  • Ensures accuracy across date boundaries

• Input Validation:

  • Accepts flexible date formats (YYYY/MM/DD or YYYY-MM-DD)
  • Validates year format (must be 4 digits)
  • Validates month range (1-12)
  • Validates day range (1-31)
  • Verifies logical date order

• Professional Error Handling:

  • Comprehensive input validation
  • Clear, language-specific error messages
  • Proper exit codes for system integration
  • User-friendly usage instructions

git clone https://github.com/felipefacundes/date_difference
cd date_difference
chmod +x date_difference

./date_difference <start_date> <end_date>

Example:

./date_difference 2023/01/01 2024/12/31

The dates must be in the format YYYY/MM/DD or YYYY-MM-DD.

This script is a component of the shell_utils framework, which provides an extensive collection of utilities for shell environments. To access the complete framework:

git clone https://github.com/felipefacundes/shell_utils

• Written in Bash
• GPLv3 License
• Follows shell scripting best practices
• Modular design with separate functions for validation and calculation
• Well-documented code with clear comments
• Suitable for both personal use and system integration

Contributions are welcome! Please feel free to submit a Pull Request. For major changes, please open an issue first to discuss what you would like to change.

This project is licensed under the GNU General Public License v3.0 - see the LICENSE file for details.

Felipe Facundes

https://github.com/felipefacundes/date_difference